/*global JSONP */
if (window.Transistor === undefined) {
    window.Transistor = {};
}

(function (transistor) {

    var Control = (function () {

        return function (broadcaster, station_uid, token) {
            var jsonp, set, insert, update, remove, command_url, send;

            jsonp = JSONP();

            set = function (channel, collection, cb) {
                send(command_url('set', channel), {collection: collection}, cb);
            };

            insert = function (channel, entry, cb) {
                send(command_url('insert', channel), {entry: entry}, cb);
            };

            update = function (channel, id, entry, cb) {
                send(command_url('update', channel), {id: id, entry: entry}, cb);
            };

            remove = function (channel, id, cb) {
                send(command_url('remove', channel), {id: id}, cb);
            };

            command_url = function (cmd, channel) {
                var base = broadcaster + '/command/' + cmd + '/' + station_uid + '/' + token;

                if (channel === undefined) {
                    return base;
                } else {
                    return base + '/' + channel;
                }
            };

            send = function (command_url, data, cb) {
                if (cb === undefined) {
                    cb = function (result) {};
                }

                if (data === undefined) {
                    jsonp.get(command_url, {}, cb);
                } else {
                    jsonp.get(command_url, {data: JSON.stringify(data)}, cb);
                }
            };

            return {
                set: set,
                insert: insert,
                update: update,
                remove: remove
            };
        };
    }());

    transistor.Control = Control;

}(window.Transistor));